Ribosomal DNA and β-tubulin data do not support the separation of the lichens Usnea florida and U-subfloridana as distinct species
Ribosomal DNA and β-tubulin data do not support the separation of the lichens Usnea florida and U-subfloridana as distinct species
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DOI：
10.1017/s0953756202005786
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发表时间：
2002-04-01
影响因子：
--
通讯作者：
Wedin, M
中科院分区：
文献类型：
--
作者：
Articus, K;Mattsson, JE;Wedin, M
美国佛罗里达地衣和美国亚佛罗里达地衣长期以来一直被认为是不同的物种。它们在形态上有许多相似之处，但有不同的繁殖策略。佛罗里达的Usnea总是提供许多药，不产生专门的无性繁殖体。佛罗里达附近的美国菊属植物有鸢尾属，鸢尾二胚属，偶尔也有鸢尾属。基于核糖体DNA ITS和LSU区域的连续序列以及β -微管蛋白编码基因的系统发育分析表明，这两个物种的标本形成了一个混合标本的单系群，而不是两个相应的形态学群，如果两个物种在一起，则会出现这种情况。讨论了地衣学中“种对”的概念。研究中包括的其他Usnea物种有：美国articulata，美国barbata，美国ceratina，美国filipendula。美国hirta，美国rigida和美国wasthii。
The lichens Usnea florida and U. subfloridana have since long been recognised as distinct species. They show many similarities in morphology, but have different reproductive strategies. Usnea florida is always provided with many apothecia and produces no specialised asexual propagules. Usnea subfloridana has soralia, isidiomorphs and occasionally apothecia. Phylogenetic analyses based on continuous sequences of the ITS and LSU regions of the nuclear ribosomal DNA and the gene coding for beta-tubulin, show that specimens of the two species form one monophyletic group of intermixed specimens, and not two groups corresponding to morphology, which Would have been expected if two species were at hand. The 'species pair' concept in lichenology is discussed. Other Usnea species included in the study are: U. articulata, U. barbata, U. ceratina, U. filipendula. U. hirta, U. rigida and U. wasmuthii.